That really depends on many factors, like whether you've taken on VC funding.
Several of the student business ventures that I'm aware of among my own peers had founders that continued to finish their undergraduate. Some took funding, others did not; all had employees and clients, so they weren't paper tigers.
You really haven't shown a good reason why she shouldn't be believed.
> and will typically be found on panel discussions about #womenintech complaining that men don't take them seriously enough, invariably blamed on sexism and not, say, their lack of any interest in or knowledge of tech.
I suspect the irony is lost on you that you are stating this while arguing that she should not be taken seriously.
> Junior PM at a company the size of modern day Meta is nothing special.
In which case, her stated experience is more than adequate.